@article{Alves_2009, title={Multiplicity of multi-bump type nodal solutions for a class of elliptic problems in ${\Bbb R}^N$}, volume={34}, url={https://apcz.umk.pl/TMNA/article/view/TMNA.2009.040}, abstractNote={In this paper, we establish existence and multiplicity of multi-bump type nodal solutions for the following class of problems $$ -\Delta u + (\lambda V(x)+ 1)u= f(u), \quad u> 0 \quad \text{in } {\mathbb R}^N, $$ where $N \geq 1$, $\lambda \in (0, \infty), f$ is a continuous function with subcritical growth and $V\colon {\mathbb R}^N \rightarrow {\mathbb R} $ is a continuous function verifying some hypotheses.}, number={2}, journal={Topological Methods in Nonlinear Analysis}, author={Alves, Claudianor O.}, year={2009}, month={Dec.}, pages={231–250} }